BOOSTXL-DRV8301: Power Supply failure during braking

Marcin Chojnacki

Part Number: BOOSTXL-DRV8301

Hi everyone

I'm working on a flywheel inverted pendulum project using F28069M and BOOSTXL-DRV8301. I have trouble with braking the flywheel. When i try to lower the speed of the motor driving the wheel from certain value (over 2k rpm) i noticed that back-emf from motor makes my power supply over-voltage protection work, and i need to restart it every time. Voltage is rising from 24V DC to something around 45V. How to easily protect against it? Should i use braking resistor/TVS/simple diode? Where to put it?

Thanks for any help

over 6 years ago

0 Adam Sidelsky over 6 years ago

TI__Guru 65390 points

Marcin,

Likely what you are seeing is excess voltage at the motor switch nodes. You can confirm this with a scope.

I would recommend a TVS or shottkey diode from all three phase nodes to GND with a breakdown voltage at least 20% higher than your VBUS but less than the overvoltage protection of your supply.

Regards,

-Adam

0 Marcin Chojnacki over 6 years ago in reply to Adam Sidelsky

Prodigy 110 points

Sorry for delay. TVS worked perfectly. Thanks for help :)

0 Adam Sidelsky over 6 years ago in reply to Marcin Chojnacki

TI__Guru 65390 points

Martin,

Could you post the TVS model number? Other viewers may benefit from this knowledge.

Regards,

-Adam

0 Marcin Chojnacki over 6 years ago in reply to Adam Sidelsky

Prodigy 110 points

I picked diodes from 1,5KE series. In my case 1.5KE30 which has 30V breakdown voltage worked well.

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BOOSTXL-DRV8301: Power Supply failure during braking